[{"data":1,"prerenderedAt":62},["ShallowReactive",2],{"q-114180-arch_structure-12":3},{"question":4,"neighbors":27,"sameNumber":46,"prev":35,"next":38},{"id":5,"classKey":6,"session":7,"year":8,"subject":9,"number":10,"groupStem":11,"ownStem":12,"stem":12,"options":13,"answer":18,"answerKind":20,"answerS":11,"answerNote":11,"images":21,"explanation":23,"withheld":11,"deepChars":24,"freq":25,"indexable":26},"arch-114180-801-0102-012","architect","114180",114,"建築結構",12,null,"如圖所示之甲乙兩支梁承受相同垂直均布靜載重，若兩梁皆為鋼筋混凝土構造，斷面(1)、(2) 皆鄰近梁端點。依圖示載重配置主要拉力鋼筋位置時，下列敘述何者正確？",{"A":14,"B":15,"C":16,"D":17},"斷面(1)於甲梁配在梁頂面，乙梁配在梁底面","斷面(2)於甲梁配在梁底面，乙梁配在梁頂面","斷面(1)於甲、乙梁皆配在梁頂面","斷面(2)於甲、乙梁皆配在梁底面",[19],"C","single",[22],"\u002Fimages\u002Farch-114180-801-0102-012.png","本題考點：懸臂梁（甲梁）與一端固定、一端滾支承的梁（乙梁）在均布載重下各斷面的彎矩正負，以及鋼筋混凝土梁的主要拉力鋼筋應配置在受拉側。\n【正解理由】混凝土抗壓強而抗拉弱，主要拉力鋼筋要放在彎矩造成拉應力的那一側：梁彎成凸面朝上（負彎矩）時梁頂受拉，凸面朝下（正彎矩）時梁底受拉。甲梁左端固定、右端自由，取任一斷面右側為自由體，右側只有向下的載重，沒有任何向上的力，所以每個斷面都是凸面朝上的負彎矩，全長梁頂受拉；越靠近固定端彎矩越大，到自由端才降為零。乙梁左端固定、右端由滾支承托住，取靠近右端的斷面看，右側自由體上有向上的支承反力，而載重才累積一小段，反力的作用占上風，彎矩為正、梁底受拉；往左走，載重累積的影響逐漸超過反力，彎矩在跨內某處變號，到固定端附近成為負彎矩、梁頂受拉。依此判讀：斷面(1)鄰近固定端，甲、乙兩梁都處於負彎矩區，主要拉力鋼筋皆配在梁頂面；斷面(2)鄰近右端，甲梁仍為負彎矩配梁頂，乙梁為正彎矩配梁底，故選 C。\n【逐項排除】\n(A) 錯誤。甲梁斷面(1)配梁頂面正確；但乙梁斷面(1)緊鄰固定端，固定端限制轉動，使該處形成負彎矩、梁頂受拉，主要拉力鋼筋應配在梁頂面，而不是梁底面。\n(B) 錯誤，兩梁的配置都上下顛倒。甲梁斷面(2)雖接近自由端、彎矩很小，但仍屬負彎矩，拉力在梁頂，應配梁頂面而非梁底面；乙梁斷面(2)鄰近滾支承，向上的支承反力使該處為正彎矩，拉力在梁底，應配梁底面而非梁頂面。\n(C) 正確。兩梁的斷面(1)都緊鄰固定端，均布載重下固定端附近一律為負彎矩，梁頂受拉，主要拉力鋼筋皆配在梁頂面。\n(D) 錯誤。乙梁斷面(2)配梁底面成立；但甲梁斷面(2)位於懸臂梁的負彎矩區，拉力在梁頂，應配梁頂面而非梁底面。\n【記憶點】懸臂梁全長梁頂拉；固定端附近梁頂拉，滾支承端附近梁底拉。",503,1,true,[28,31,34,37,40,43],{"number":29,"session":7,"stem":30},9,"某等跨距構架活載重 w 全部負載、間隔負載如圖(a)、圖(b)所示，若活載重大於靜載…",{"number":32,"session":7,"stem":33},10,"若一地震之顯著振動週期為 1 秒，則對一般建築物而言，樓高幾層者易與該地震形成共振現…",{"number":35,"session":7,"stem":36},11,"高層建築物可利用於較高樓層處懸吊鋼球或設置水箱來抵抗風力作用，則下列敘述何者錯誤？",{"number":38,"session":7,"stem":39},13,"下列有關結構穩定性與靜定性之敘述，何者錯誤？",{"number":41,"session":7,"stem":42},14,"圖示之梁構造中 C 為鉸接，不考慮自重影響，在 B 出現微小垂直沉陷時，下列敘述何者…",{"number":44,"session":7,"stem":45},15,"如圖所示的桁架，C 點承受一個集中載重 P 之作用，假設每一支桿件的彈性模數和斷面尺…",[47,50,53,56,59],{"number":10,"session":48,"stem":49},"113190","非結構物耐震考量，下列敘述何者錯誤？",{"number":10,"session":51,"stem":52},"112190","如下圖所示，一構件斜面之中心點受一水平力 P=1000 N 作用，此斜面與水平方向之…",{"number":10,"session":54,"stem":55},"111180","在結構系統的規劃上，下列敘述何者錯誤？",{"number":10,"session":57,"stem":58},"110180","圖示之鋼筋混凝土韌性構架，有關主筋搭接之敘述，下列何者正確？ D A B C",{"number":10,"session":60,"stem":61},"109180","圖示結構物為幾度靜不定？鉸接",1791863195423]